1 #ifndef _ASM_GENERIC_PERCPU_H_
2 #define _ASM_GENERIC_PERCPU_H_
3 #include <linux/compiler.h>
4
5 #define __GENERIC_PER_CPU
6 #ifdef CONFIG_SMP
7
8 extern unsigned long __per_cpu_offset[NR_CPUS];
9
10 /* Separate out the type, so (int[3], foo) works. */
11 #define DEFINE_PER_CPU(type, name) \
12 __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
13
14 /* var is in discarded region: offset to particular copy we want */
15 #define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]))
16 #define __get_cpu_var(var) per_cpu(var, smp_processor_id())
17
18 /* A macro to avoid #include hell... */
19 #define percpu_modcopy(pcpudst, src, size) \
20 do { \
21 unsigned int __i; \
22 for (__i = 0; __i < NR_CPUS; __i++) \
23 if (cpu_possible(__i)) \
24 memcpy((pcpudst)+__per_cpu_offset[__i], \
25 (src), (size)); \
26 } while (0)
27 #else /* ! SMP */
28
29 #define DEFINE_PER_CPU(type, name) \
30 __typeof__(type) per_cpu__##name
31
32 #define per_cpu(var, cpu) (*((void)cpu, &per_cpu__##var))
33 #define __get_cpu_var(var) per_cpu__##var
34
35 #endif /* SMP */
36
37 #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
38
39 #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
40 #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
41
42 #endif /* _ASM_GENERIC_PERCPU_H_ */
43
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